\I\KIM: AM;.K. II 



from ite edges about fifty proliferations. The whole plant is quite sterile, of very 

 thin t-\tiiiv, .-iii-I consists of an internal tissue enclosed in a cortex which is mono- 

 stromatic except at the margin. The structure, however, owing to the crushed 

 "M'htiMii of its interior cells, affords hut little clue to the systematic position of the 

 plant, and all our efforts to make the internal tissue swell out to its original dimensions 

 were in vain. We were therefore unable to figure the structure except near the much- 

 thickened margin of the proliferating scrap of old frond mentioned above (fig. 18). 

 The cells of the monostromatic cortex are large (fig. 19). 



In li.-iliit it iv-mililes J)unnmtin,]mt has not the hollow thallus and filamentous 

 cell -structure of that genus. Our plant has a solid thallus, and for that reason we 

 should not have searched for it under Haloaaccwn, but strangely enough wo find 

 the Cape Adare plant to be apparently identical with //. dumontwides Ifarv., an 

 undcscribcd species from the far North. The habit, the thin texture, the mono- 

 stromatic layer of rather large coloured cortical cells, and the permanently collapsed 

 internal tissue are the same in both. The proliferations in Harvey's plant arc linear 

 and very long (fig. 20) ; in the Cape Adare plant they are half as long, and arc 

 cuneato-liuear and tending to be forked at the apex. Dickie (Journ. Linn. Soc. IX. 

 [1867], p. 239) stated that //. dumontioides was first described by Prof. Harvey 

 from specimens found by Dr. Lyall in Lat. 76 N. We failed, however, to find any 

 published description, and applied to Dr. E. Perceval Wright, Keeper of Harvey's 

 herbarium, Trinity College, Dublin, for information. He kindly replied : " I think 

 that a description of JIalosaccion dunwntioides has never appeared. Dr. Lyall's 

 specimens were collected in July, 1853. Harvey was on his Australian tour, 1853-56, 

 and in 1857 was busy with his Phycologia Australian (1858-1863). All our sheets 

 with Lyall's specimens are marked in pencil with the name and ' Harv. MS.' Now 

 when Harvey published a name, he mostly wrote the name in ink on the sheet. On 

 one of our sheets he has written, still in pencil, ' Can this be a var. of //. ramen- 

 taccum ? ' It is strange that J. G. Agardh did not write to me for a specimen in 

 1876." that is, before publishing his Epicrisls. 



Harvey, having only dried material to work upon, and being therefore unable to 

 determine the character of the internal tissue, was in doubt as to the affinity of the 

 plant, and placed it in llalosaccitm near If. ramentneeum. There we should have been 

 compelled to leave it, had we not found a similar crushed tissue and monostromatic 

 cortex in another species, Gracilaria simplex, of which we had received not only dried 

 specimens, but also spirit material, and to which we regard our plant as closely allied. 

 However, none of the specimens of either species have cystocarps, and their systematic 

 position may have to be reconsidered later.* 



Dickie (/<*?. cit.) records plants collected in Cumberland Sound (66 N. lat.) by 



Since tbe*e line* were lent to preu we hare wen MOM wy fine Antarctic Hpccimcnii, collected by Dr. C. 

 HkotUberg during the Swedish Booth Polar Expedition, which lead u to believe that oar Antarctic plant in not 

 fully grown, and U not conspeciflc with Harvey ' plant of O. dumontioidet. Dr. Skotfeberg will deal with the 

 qoectiog in hu own report. 



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